I might try it. I don't think you'll get any less pepper mass with 2, and you might get more. Either you'll get one big plant with tons of peppers, or 2 smaller plants with less peppers. You might have to feed the 2 more than the one though. I have a bit of an overcrowding bias I might add :-)

This question is often discussed on the hot pepper forum. Many experienced growers think that peppers need about 5 gallons each in a container. Unlike many other members of the nightshade family, peppers have a reputation for liking to "hold hands," or grow close to one another. I have been growing 3 peppers in 15 to 20 gallon containers for several years with good yields. I would guess your container holds 10-15 gallons, so I think 2 plants will work in your container.

You can put 4 pepper plants in that container and do well. Let the plants lean out and down. They will fill out very nicely and will need minimal support. Place each plant in the center of its side wall about 3 inches in from the side wall. Last year I use 5 gallon buckets and did extremely well with the most productive plants since I started 20 years ago. A 55 gallon half drum will hold 5 plants. I have 13; 55 gallon drums to prepare but have not decided where to use them

I had 4 of the finest Red Bell pepper plants I ever grew last year.
In one container app.15 across X 16 deep.
Fantastic peppers and plants, until the deer ate the leaves.
I fenced them in, however it must have been to much for them and they did not do well after that.
I did get a few nice peppers tho.
I used epsom salts, and a mix from our local feed & supply